git.sesse.net Git - ffmpeg/blob - libavcodec/libschroedingerdec.c

   1 /*
   2  * Dirac decoder support via Schroedinger libraries
   3  * Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com >
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23 * @file
  24 * Dirac decoder support via libschroedinger-1.0 libraries. More details about
  25 * the Schroedinger project can be found at http://www.diracvideo.org/.
  26 * The library implements Dirac Specification Version 2.2.
  27 * (http://dirac.sourceforge.net/specification.html).
  28 */
  29
  30 #include "libavutil/imgutils.h"
  31 #include "libavutil/intreadwrite.h"
  32 #include "avcodec.h"
  33 #include "libschroedinger.h"
  34
  35 #include <schroedinger/schro.h>
  36 #include <schroedinger/schrodebug.h>
  37 #include <schroedinger/schrovideoformat.h>
  38
  39 /** SchroFrame and Pts relation */
  40 typedef struct LibSchroFrameContext {
  41      SchroFrame *frame;
  42      int64_t pts;
  43 } LibSchroFrameContext;
  44
  45 /** libschroedinger decoder private data */
  46 typedef struct SchroDecoderParams {
  47     /** Schroedinger video format */
  48     SchroVideoFormat *format;
  49
  50     /** Schroedinger frame format */
  51     SchroFrameFormat frame_format;
  52
  53     /** decoder handle */
  54     SchroDecoder* decoder;
  55
  56     /** queue storing decoded frames */
  57     FFSchroQueue dec_frame_queue;
  58
  59     /** end of sequence signalled */
  60     int eos_signalled;
  61
  62     /** end of sequence pulled */
  63     int eos_pulled;
  64
  65     /** decoded picture */
  66     AVFrame dec_frame;
  67 } SchroDecoderParams;
  68
  69 typedef struct SchroParseUnitContext {
  70     const uint8_t *buf;
  71     int           buf_size;
  72 } SchroParseUnitContext;
  73
  74
  75 static void libschroedinger_decode_buffer_free(SchroBuffer *schro_buf,
  76                                                void *priv)
  77 {
  78     av_freep(&priv);
  79 }
  80
  81 static void parse_context_init(SchroParseUnitContext *parse_ctx,
  82                                const uint8_t *buf, int buf_size)
  83 {
  84     parse_ctx->buf           = buf;
  85     parse_ctx->buf_size      = buf_size;
  86 }
  87
  88 static SchroBuffer *find_next_parse_unit(SchroParseUnitContext *parse_ctx)
  89 {
  90     SchroBuffer *enc_buf = NULL;
  91     int next_pu_offset = 0;
  92     unsigned char *in_buf;
  93
  94     if (parse_ctx->buf_size < 13 ||
  95         parse_ctx->buf[0] != 'B' ||
  96         parse_ctx->buf[1] != 'B' ||
  97         parse_ctx->buf[2] != 'C' ||
  98         parse_ctx->buf[3] != 'D')
  99         return NULL;
 100
 101     next_pu_offset = (parse_ctx->buf[5] << 24) +
 102                      (parse_ctx->buf[6] << 16) +
 103                      (parse_ctx->buf[7] <<  8) +
 104                       parse_ctx->buf[8];
 105
 106     if (next_pu_offset == 0 &&
 107         SCHRO_PARSE_CODE_IS_END_OF_SEQUENCE(parse_ctx->buf[4]))
 108         next_pu_offset = 13;
 109
 110     if (next_pu_offset <= 0 || parse_ctx->buf_size < next_pu_offset)
 111         return NULL;
 112
 113     in_buf = av_malloc(next_pu_offset);
 114     if (!in_buf) {
 115         av_log(parse_ctx, AV_LOG_ERROR, "Unable to allocate input buffer\n");
 116         return NULL;
 117     }
 118
 119     memcpy(in_buf, parse_ctx->buf, next_pu_offset);
 120     enc_buf       = schro_buffer_new_with_data(in_buf, next_pu_offset);
 121     enc_buf->free = libschroedinger_decode_buffer_free;
 122     enc_buf->priv = in_buf;
 123
 124     parse_ctx->buf      += next_pu_offset;
 125     parse_ctx->buf_size -= next_pu_offset;
 126
 127     return enc_buf;
 128 }
 129
 130 /**
 131 * Returns FFmpeg chroma format.
 132 */
 133 static enum PixelFormat get_chroma_format(SchroChromaFormat schro_pix_fmt)
 134 {
 135     int num_formats = sizeof(schro_pixel_format_map) /
 136                       sizeof(schro_pixel_format_map[0]);
 137     int idx;
 138
 139     for (idx = 0; idx < num_formats; ++idx)
 140         if (schro_pixel_format_map[idx].schro_pix_fmt == schro_pix_fmt)
 141             return schro_pixel_format_map[idx].ff_pix_fmt;
 142     return PIX_FMT_NONE;
 143 }
 144
 145 static av_cold int libschroedinger_decode_init(AVCodecContext *avccontext)
 146 {
 147
 148     SchroDecoderParams *p_schro_params = avccontext->priv_data;
 149     /* First of all, initialize our supporting libraries. */
 150     schro_init();
 151
 152     schro_debug_set_level(avccontext->debug);
 153     p_schro_params->decoder = schro_decoder_new();
 154     schro_decoder_set_skip_ratio(p_schro_params->decoder, 1);
 155
 156     if (!p_schro_params->decoder)
 157         return -1;
 158
 159     /* Initialize the decoded frame queue. */
 160     ff_schro_queue_init(&p_schro_params->dec_frame_queue);
 161     return 0;
 162 }
 163
 164 static void libschroedinger_decode_frame_free(void *frame)
 165 {
 166     schro_frame_unref(frame);
 167 }
 168
 169 static void libschroedinger_handle_first_access_unit(AVCodecContext *avccontext)
 170 {
 171     SchroDecoderParams *p_schro_params = avccontext->priv_data;
 172     SchroDecoder *decoder = p_schro_params->decoder;
 173
 174     p_schro_params->format = schro_decoder_get_video_format(decoder);
 175
 176     /* Tell FFmpeg about sequence details. */
 177     if (av_image_check_size(p_schro_params->format->width,
 178                             p_schro_params->format->height, 0, avccontext) < 0) {
 179         av_log(avccontext, AV_LOG_ERROR, "invalid dimensions (%dx%d)\n",
 180                p_schro_params->format->width, p_schro_params->format->height);
 181         avccontext->height = avccontext->width = 0;
 182         return;
 183     }
 184     avccontext->height  = p_schro_params->format->height;
 185     avccontext->width   = p_schro_params->format->width;
 186     avccontext->pix_fmt = get_chroma_format(p_schro_params->format->chroma_format);
 187
 188     if (ff_get_schro_frame_format(p_schro_params->format->chroma_format,
 189                                   &p_schro_params->frame_format) == -1) {
 190         av_log(avccontext, AV_LOG_ERROR,
 191                "This codec currently only supports planar YUV 4:2:0, 4:2:2 "
 192                "and 4:4:4 formats.\n");
 193         return;
 194     }
 195
 196     avccontext->time_base.den = p_schro_params->format->frame_rate_numerator;
 197     avccontext->time_base.num = p_schro_params->format->frame_rate_denominator;
 198 }
 199
 200 static int libschroedinger_decode_frame(AVCodecContext *avccontext,
 201                                         void *data, int *data_size,
 202                                         AVPacket *avpkt)
 203 {
 204     const uint8_t *buf = avpkt->data;
 205     int buf_size = avpkt->size;
 206     int64_t pts  = avpkt->pts;
 207     SchroTag *tag;
 208
 209     SchroDecoderParams *p_schro_params = avccontext->priv_data;
 210     SchroDecoder *decoder = p_schro_params->decoder;
 211     SchroBuffer *enc_buf;
 212     SchroFrame* frame;
 213     int state;
 214     int go = 1;
 215     int outer = 1;
 216     SchroParseUnitContext parse_ctx;
 217     LibSchroFrameContext *framewithpts = NULL;
 218
 219     *data_size = 0;
 220
 221     parse_context_init(&parse_ctx, buf, buf_size);
 222     if (!buf_size) {
 223         if (!p_schro_params->eos_signalled) {
 224             state = schro_decoder_push_end_of_stream(decoder);
 225             p_schro_params->eos_signalled = 1;
 226         }
 227     }
 228
 229     /* Loop through all the individual parse units in the input buffer */
 230     do {
 231         if ((enc_buf = find_next_parse_unit(&parse_ctx))) {
 232             /* Set Schrotag with the pts to be recovered after decoding*/
 233             enc_buf->tag = schro_tag_new(av_malloc(sizeof(int64_t)), av_free);
 234             if (!enc_buf->tag->value) {
 235                 av_log(avccontext, AV_LOG_ERROR, "Unable to allocate SchroTag\n");
 236                 return AVERROR(ENOMEM);
 237             }
 238             AV_WN(64, enc_buf->tag->value, pts);
 239             /* Push buffer into decoder. */
 240             if (SCHRO_PARSE_CODE_IS_PICTURE(enc_buf->data[4]) &&
 241                 SCHRO_PARSE_CODE_NUM_REFS(enc_buf->data[4]) > 0)
 242                 avccontext->has_b_frames = 1;
 243             state = schro_decoder_push(decoder, enc_buf);
 244             if (state == SCHRO_DECODER_FIRST_ACCESS_UNIT)
 245                 libschroedinger_handle_first_access_unit(avccontext);
 246             go = 1;
 247         } else
 248             outer = 0;
 249
 250         while (go) {
 251             /* Parse data and process result. */
 252             state = schro_decoder_wait(decoder);
 253             switch (state) {
 254             case SCHRO_DECODER_FIRST_ACCESS_UNIT:
 255                 libschroedinger_handle_first_access_unit(avccontext);
 256                 break;
 257
 258             case SCHRO_DECODER_NEED_BITS:
 259                 /* Need more input data - stop iterating over what we have. */
 260                 go = 0;
 261                 break;
 262
 263             case SCHRO_DECODER_NEED_FRAME:
 264                 /* Decoder needs a frame - create one and push it in. */
 265                 frame = ff_create_schro_frame(avccontext,
 266                                               p_schro_params->frame_format);
 267                 schro_decoder_add_output_picture(decoder, frame);
 268                 break;
 269
 270             case SCHRO_DECODER_OK:
 271                 /* Pull a frame out of the decoder. */
 272                 tag   = schro_decoder_get_picture_tag(decoder);
 273                 frame = schro_decoder_pull(decoder);
 274
 275                 if (frame) {
 276                     /* Add relation between schroframe and pts. */
 277                     framewithpts = av_malloc(sizeof(LibSchroFrameContext));
 278                     if (!framewithpts) {
 279                         av_log(avccontext, AV_LOG_ERROR, "Unable to allocate FrameWithPts\n");
 280                         return AVERROR(ENOMEM);
 281                     }
 282                     framewithpts->frame = frame;
 283                     framewithpts->pts   = AV_RN64(tag->value);
 284                     ff_schro_queue_push_back(&p_schro_params->dec_frame_queue,
 285                                              framewithpts);
 286                 }
 287                 break;
 288             case SCHRO_DECODER_EOS:
 289                 go = 0;
 290                 p_schro_params->eos_pulled = 1;
 291                 schro_decoder_reset(decoder);
 292                 outer = 0;
 293                 break;
 294
 295             case SCHRO_DECODER_ERROR:
 296                 return -1;
 297                 break;
 298             }
 299         }
 300     } while (outer);
 301
 302     /* Grab next frame to be returned from the top of the queue. */
 303     framewithpts = ff_schro_queue_pop(&p_schro_params->dec_frame_queue);
 304
 305     if (framewithpts && framewithpts->frame) {
 306         if (p_schro_params->dec_frame.data[0])
 307             avccontext->release_buffer(avccontext, &p_schro_params->dec_frame);
 308         if (avccontext->get_buffer(avccontext, &p_schro_params->dec_frame) < 0) {
 309             av_log(avccontext, AV_LOG_ERROR, "Unable to allocate buffer\n");
 310             return AVERROR(ENOMEM);
 311         }
 312
 313         memcpy(p_schro_params->dec_frame.data[0],
 314                framewithpts->frame->components[0].data,
 315                framewithpts->frame->components[0].length);
 316
 317         memcpy(p_schro_params->dec_frame.data[1],
 318                framewithpts->frame->components[1].data,
 319                framewithpts->frame->components[1].length);
 320
 321         memcpy(p_schro_params->dec_frame.data[2],
 322                framewithpts->frame->components[2].data,
 323                framewithpts->frame->components[2].length);
 324
 325         /* Fill frame with current buffer data from Schroedinger. */
 326         p_schro_params->dec_frame.format  = -1; /* Unknown -1 */
 327         p_schro_params->dec_frame.width   = framewithpts->frame->width;
 328         p_schro_params->dec_frame.height  = framewithpts->frame->height;
 329         p_schro_params->dec_frame.pkt_pts = framewithpts->pts;
 330         p_schro_params->dec_frame.linesize[0] = framewithpts->frame->components[0].stride;
 331         p_schro_params->dec_frame.linesize[1] = framewithpts->frame->components[1].stride;
 332         p_schro_params->dec_frame.linesize[2] = framewithpts->frame->components[2].stride;
 333
 334         *(AVFrame*)data = p_schro_params->dec_frame;
 335         *data_size      = sizeof(AVFrame);
 336
 337         /* Now free the frame resources. */
 338         libschroedinger_decode_frame_free(framewithpts->frame);
 339         av_free(framewithpts);
 340     } else {
 341         data       = NULL;
 342         *data_size = 0;
 343     }
 344     return buf_size;
 345 }
 346
 347
 348 static av_cold int libschroedinger_decode_close(AVCodecContext *avccontext)
 349 {
 350     SchroDecoderParams *p_schro_params = avccontext->priv_data;
 351     /* Free the decoder. */
 352     schro_decoder_free(p_schro_params->decoder);
 353     av_freep(&p_schro_params->format);
 354
 355     if (p_schro_params->dec_frame.data[0])
 356         avccontext->release_buffer(avccontext, &p_schro_params->dec_frame);
 357
 358     /* Free data in the output frame queue. */
 359     ff_schro_queue_free(&p_schro_params->dec_frame_queue,
 360                         libschroedinger_decode_frame_free);
 361
 362     return 0;
 363 }
 364
 365 static void libschroedinger_flush(AVCodecContext *avccontext)
 366 {
 367     /* Got a seek request. Free the decoded frames queue and then reset
 368      * the decoder */
 369     SchroDecoderParams *p_schro_params = avccontext->priv_data;
 370
 371     /* Free data in the output frame queue. */
 372     ff_schro_queue_free(&p_schro_params->dec_frame_queue,
 373                         libschroedinger_decode_frame_free);
 374
 375     ff_schro_queue_init(&p_schro_params->dec_frame_queue);
 376     schro_decoder_reset(p_schro_params->decoder);
 377     p_schro_params->eos_pulled = 0;
 378     p_schro_params->eos_signalled = 0;
 379 }
 380
 381 AVCodec ff_libschroedinger_decoder = {
 382     .name           = "libschroedinger",
 383     .type           = AVMEDIA_TYPE_VIDEO,
 384     .id             = CODEC_ID_DIRAC,
 385     .priv_data_size = sizeof(SchroDecoderParams),
 386     .init           = libschroedinger_decode_init,
 387     .close          = libschroedinger_decode_close,
 388     .decode         = libschroedinger_decode_frame,
 389     .capabilities   = CODEC_CAP_DELAY,
 390     .flush          = libschroedinger_flush,
 391     .long_name      = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),
 392 };